undercharge

From under- +‎ charge.

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undercharge (third-person singular simple present undercharges, present participle undercharging, simple past and past participle undercharged)

1. (ambitransitive) To charge less than the correct amount.

   to undercharge for goods or services

   to undercharge a customer

2. (transitive, firearms) To put too small a charge into.

   to undercharge a gun

• overcharge

undercharge (plural undercharges)

1. A monetary charge that is less than the correct amount.